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Table 4 Data of the Precision Study of NCT and TRT for the Proposed Method

From: Development and validation of derivative UV spectroscopic method for simultaneous estimation of nicotinamide and tretinoin in their binary mixtures and pharmaceutical preparations

Precision

NCT RSD%

TRT RSD%

Categorya

253 nm D1

245 nm D2

269 nm D2

348 nm D0

Intraday

0.73

1.02

0.92

0.76

Inter-day 24 h

1.49

0.62

0.97

1.07

Inter-day 48 h

1.89

0.98

1.19

1.51

total repetitions

1.41

0.90

1.00

1.11

  1. aFor each category: there are three concentrations and three repetitions for each concentration with a total of 27 repetitions